Thailand · Sweet finish

Tub tim krob

Crisp water chestnut rubies in sweet iced coconut milk

Little cubes of water chestnut, dyed ruby red, coated in tapioca and boiled until they turn glassy and chewy outside and stay crunchy within, served over crushed ice with pandan syrup and salted sweet coconut milk.

Tub tim krob

Tub tim krob means crisp rubies, and the name is an accurate description rather than a flight of fancy. Small cubes of water chestnut are soaked in red syrup, rolled in tapioca starch and dropped into boiling water, where the starch turns into a clear, jelly like coat. The result looks like a bowl of polished garnets: chewy and slippery on the outside, with a clean, fresh crunch in the middle. They are spooned over crushed ice with a sugar syrup and a pour of coconut milk, and the whole thing is gone in about the time it took to read this sentence.

It is one of Thailand's best loved cold desserts, sold from street carts and dessert shops all year and in especially large quantities in the hot season, which in Thailand is a matter of degree. Shops often add jackfruit, young coconut or a scent of jasmine to the syrup, and some use smoked coconut milk for an extra layer of fragrance.

At home it is quick, inexpensive and a little bit magical to make. The only trick is timing: the rubies are best within a couple of hours of cooking, so make them close to serving.

Pandan syrup

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Sweet coconut milk

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The rubies

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Serving

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